Yurii Loiko

TL;DR: An increase in one order of magnitude in the channel capacity for free space optical communications (FSOC) of a monochromatic input Gaussian beam at 640 nm for a free space propagation distance of 4m with controlled crosstalk is observed.

TL;DR: In this article, a conical refraction de-multiplexing and multiplexing method was proposed to increase the channel capacity for free space optical communication applications, which is based on the forward-backward optical transform occurring when a light beam propagates consecutively along the optic axes of two identical biaxial crystals with opposite orientations of their conical characteristic vectors.

TL;DR: A simple formulation for the pattern formation for both circularly and linearly polarized input beams, that could be applied for a cascade of an arbitrary number of BCs, is provided.

Abstract: We introduce a coherent technique to inject, extract, and velocity filter neutral atoms in a ring trap coupled via tunneling to two additional waveguides. By adiabatically following the transverse spatial dark state, the proposed technique allows for an efficient and robust velocity dependent atomic population transfer between the ring and the input/output waveguides. We have derived explicit conditions for the spatial adiabatic passage that depend on the atomic velocity along the input waveguide as well as on the initial population distribution among the transverse vibrational states. The validity of our proposal has been checked by numerical integration of the corresponding two-dimensional Schrodinger equation with state-of-the-art parameter values for 87 Rb atoms and an optical dipole ring trap.

TL;DR: Taking into account the different two-photon processes involved in SHG, analytical expressions for the resulting transverse intensity patterns are derived that are in good agreement with the experimental data.